The shape is an octagon.
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A three-dimensional shape with eight triangular faces is called an octahedron.
A two dimensional shape would have 17 sides. For a three dimensional shape - assuming that sides are faces - the answer depends on the shape itself.
When two sides (called faces) of a 3-dimensional shape meet, they meet at an edge.
That is called a polygon.
A dodecahedron is a three-dimensional shape with 12 pentagonal sides.